Electrical Issue at light switch?

[Steve_Mack_CT]

Had an issue yesterday where I lost all lights and horn. quick check of exposed wires showed no issues, and when I restarted the car I got them back. My wife checked brake lights for me and they seemed weak to her, but it is admittedly an untrained eye.

So my thought is some issue at the steering wheel base where light switch contacts are? I have a new battery, run a fuse at the typical starter to wiring harness location and all those connections checked out.

Harness looks to have been done at some point, but before me, and all lights, horn, etc. are functioning fine otherwise.

I have not yet consulted Les Andrew's book as this happened towards end of the day yesterday and close to home.

So my question is, are there known issues/subsequent shortcuts to help diagnose the issue given these symptoms?

We put on 50 miles yesterday, car is running great but I won't likely stray that far from home until I correct this.

Thanks guys - appreciate any tips and advice!